Piston packing-ring.



M. MQRATTA. PISTON PACKING RING.

I APPLICATION FILED IAN. I5|19I7 1,251,996I Patented Jan. 1, 1918.

` 2 SHEETS-SHEET I.

MaJCI-LawMmr asl'a' M. MOBATTA. PISTON PACKING RING.

l u I APPLICATION FILED IAN. l5, |917. 1,251,906. Patented t1111111918.

. 2 SHEETS-SHEET 2- is to provide fully brought IMTHEW MORATTA, OFPRXNCETON, INDIANA.

PISTON PACKING-RING.

To 'all whom 'it may concern.'

Be it known that I, MA'rHEw MORA'rra,y

a citizen of the United States, and a resident of Princeton,'in the county of Gibson and State of Indiana, have invented a ce1'.- tain new and useful Improvement in Piston Packing-Rings, of which the following is a speciiication. f

The present invention relates toy piston rings adapted for use in steam, internal combustion engine, air brake, and other cylinders, and has for an objectto provide a ring of such construction that it is adapted particularly for packing pistons in the cylinder when the same has become unevenly worn or scored.

The invention further aims at the provision of a piston ring which is provided with means for carrying a` quantityl of graphite, or the like adapted to fill in the pits and scores inthe cyllnder wall and to thus pack and provide a close fit for the piston and its ring, and prevent further and undue wear upon the walls of the cylinder. This feature of the invention also embraces the provision of means for supporting a carrier body or medium for the graphite, and for a lubricant if desired to constantly and effectively apply a lubricant to the walls of the cylinder.

A. further object of the present invention a two-part eXpansible ring possessing the above characteristics and which is so constructed and assembled that the leakage of steam, air, or thecharge of an internal combustion engine is prevented from escaping past the piston ring.

The above, and-various other objects and advantages' of this invention will be more out in they following detailed description of the present preferred embodiment of this invention, the same being illustrated in the accompanying drawings wherein:

Figure 1 is a plan view of a ring constructed according 'to the present invention.

Fig. 2 is an edge view of the same, disclosing the overlapping ends ,of the outer section of the ring.

Fig. 3 is a detail enlarged sectional view through one side of the ring, takenon the line 3-3 of Fig. 1 ing pin for holding the ring sections 1n interttting relation.

Fig. 4 is a similar view taken on the line /1--4 of Fig. 1 showing the intertting re- 'Specioation of Letters Patent.

and showing the. anchor- Patented Jan. 1, 1918.

Application filed January 145-, 19171 Serial No. 142,508.

lation of the ring sections, and showing the filler of graphite or the like carried in the outer ring section.

Fig. 5 is a similar view taken on the line 5-5 of Fi l, showing the intertting relation of t e ring sections, and the overlapping endsv of the outer section.

Fig. 6 is a detail enlarged perspective' view of the medtingends of the outer ring section, showing the peripheral groove for the reception of the graphite or the like.

Fig. 7 is a detail perspective view `showing one end of the inner section.

Fig. 8 is a plan view of a portion of, a piston ring, showing a modification from the form of Fig. 1, and being constructed according to the present invention.'

Fig. 9 is an'edge view of thesame disclosing the overlapping ends of the outer ring section.

Fig. 10 is a transverse section taken on the line 10-10 of Fig. '8, -showingthe overlapping ends of the outer ring section and the interfitting engagement of the inner ring section therewith.`

Fig. 11 is a transverse section taken on the line 11-11 of Fig. 8 showing the interfitting engagement ofthe ring sections at a point intermediate their ends. v

Fig. 12 is a fragmentary plan view'of another modied form of the packing ring constructed accordingto the present invenp tion.

Fig. 13 is an edge view of the same, disclosing the overlapping endsl of the outer end` section. y

Fig. 14 is a detail perspective view of one end of the inner ring section of vthe modified form of Fig. 12.

Fig. 15 is a transverse section taken through the ring of Fig. 12, showing the' same as ap lied to the groove of a piston.

Fig. 16 is a fragmentary plan view of a further modified form of the piston ring constructed according to this invention.

Fig. 17 is an edge view of the same, showing the overlapping ends of the outer ring section.

' Fig. 18 isa transverse section through the form shown in Fig. 16, showing the same ,as applied to the ring groove of the piston. Fig. 1 9 is a fragmentary perspective view,

enlarged, of the' end of the inner ring section of the form shown in Fig. 16.

ReferringV to these drawings, and first to the form disclosed in Figs. 1 to 7, inclusive,

the ring comprises a pair of interfitting inner and outer sections 25 and 26 which are adapted vto lie substantially in the same transverse plane. The inner ring section 25 comprises a substantially annular body having its extremities closely spaced apart and provided at one edge, which may be designated as the upper edge of the section, with a circumferential outwardly extending flange 27 adapted to tit in a rabbet or depression 28 formed in the upper face of the outer section 26. rl`he ring sections 25 and 26 are substantially of the same thickness, and normally, the upper and lower faces thereof are adapted to lie iush. The outer section 26 is also of substantially annular form and has its extremities 29 oppositely reduced and overlapped to provide an overlapping joint for the ring section, as clearly' shown in Fig. 2.

rlhe outer ring section 26 is provided at its inner side, and midwaybetween its overlapping ends 29, with an inwardly projecting pin 30 adapted to lie between the closelyspaced-apart ends of the inner ring section 25 to engage the latter and hold the inner ring section from turning within the outer section. The pin 30 thus holds the sections -in circumferential overlapping relation to prevent ythe working of the spaced-apart ends ofthe ring sections to one side of the ring.

The outer ring section 26 is provided in its periphery with a longitudinalgroove 3l which extends entirely around thel ring, and which is reduced and co-extensive with the extremities or tongues 29 of the outer section.

This groove 31 is adapted to contain a' quantity of graphite 32 which is preferably admixed with'asbestos, the latter providing a carrier or retainer for the graphite to hold the same within the groove and for ready lapplication to the walls of the cylinder. llf desired7 a lubricantv may be admixed with the asbestos and the graphite for lubricating the cylinder walls'` and preventing undue wear thereon. Graphite is not primarily a lubricant, but is more in the nature of a filler so that .during the reciprocating action of the piston the graphite is rubbed into the pits and scores of the cylinder and is adapted to more or less lill the same and thus pack the piston tightly in the cylinder. The asbestos is found to' be an excellent carrier medium for supporting'the graphite in the groove 3l 'and for holding it in positionfor contact with the walls of the cylinder to take up wear upon the same. By the use of4 this filler materiahor graphite, the inner wall of the cylinder is made to conform to the contour of the piston and its ring, and. thus the piston is tightly sealed at all times in the cylinder.

ln the modiiiedform ofthe invention disclosed in Figs. 8 to ll, inclusive, the inner Latinos ring section 25a is of substantially the saine form as disclosed in Fig. l with the exception that it is of' less width than the outer ring section 262.

The outer ring section 26EL is provided at its lower side, and at its outer edge with a peripherally extending flange 33 adapted to lap beneath the inner ring section 26 and support the same, and provide between the sections a pair ot substantially parallel offset bearing surfaces arranged in stepped relation to permit of the sliding of the sections one upon the other and to provide a double seal therebetween.,

A further modied form of the invention is disclosed in Figs. l2 to l5, inclusive, and wherein the inner ring section 25hl is relatively thin and may be 'termed or spring -metal and slightly reduced at its opposite edges. The resilient opposite edges of the inner section 25b are overturned upon themselves into substantially S-shape to provide resiliently supporting bearing flanges 34 adapted for contact with the opposite walls of the ring groove in the piston A, as shown in Fig. l5. '.lheseV resiliently supported flanges 3ft are adapted to bear against the walls of the ring groove sufficiently to seal the inner ring section therein, and to yield llldti 19' inclusive, the inner ring section 25"l is re atively dat and provided at its upper and lower edges with outwardly extending peripheral anges 37 which are rolled over toward each other at their outer edges to provide returned .portions or hoolrs38b rllhe outer ring section 26 is provided at its inner side with undercut slots lwhich extend through the opposite edges of the ring and provide at the rear side ot the ring a sublill@ stantially 1V-shaped tongue or head 39 the projecting portions of lwhich are adapted for engagement beneath thehooks 38.. As shown in Fig. 18, the danges 37 of the inner ring section aresprung outwardly from each other and are adapted for .frictional engagement against the inner opposite walls of the Vring grpove of the piston A.. The danges or proJecting portions of the tongue 39 of the outer section permit of the movement of the hooks 38 toward and from each other as the flanges 3i' are'subinitted to compression. As 'in the structure shown inA Fig. l5, the

naamw mit the uninterrupted sliding movement oi the inner ring section in the ring groove.

It will be noted that in all forms of the invention the outer ring section 26 is provided with the annular peripheral groove and the packing or iiller material carried in the groove for application to the inner Walls of the cylinder.

It is to be understood that various changes and modifications may be made, further than above set forth, without departing from the spirit of the invention, and being restricted only by the scope' of the following claims. l

. lLin a piston ring, the combination of a pair of intertting annular split sections in circumferentially overlapping relation, the outer section having its ends reduced and loverlapped and provided with a lubricantreceiving groove extending continuously throughout the length of the outer section and being reduced and extending into said overlapping ends, and a lubricant body tting in the groove throughout its length and into the reduced ends thereof to provide a continuous uninterrupted seal about the piston ring when in place and .in various dcgrees ofcompression.

2. ln a. piston ring, the combination of a pair of interlitting annular split sections in circumferentiall'y overlapfing relation, the outer section belng provi ed with a reduced inner portion, and the inner section being provided with opposed spring anges adapted for engagement with the inner portion of said outer section for interlocking the sections together. I

3. ina piston ring, the combination of a 'pair of interiitting annular split sections 1n circumferentially over-lapping relation, the inner section belng provided at its opposite edges with substantially S-shaped portions providing a pair of inner flanges adapted for engagement 'with the opposite sides of the outer section and with a pair of outer anges adapted to bear against the walls of the ring groove of a piston.

4.111 a piston ring, the combination of a pair ofintertting annular split sections in circumferentiall over-lapping relation, the outer section belng provided with a tongue upon its inner side, and the inner section bein provided with a pairof outwardly eX- tending flanges for engagement against the opposite sides of the tongue for interlocking the sections together andffor yieldable engagement against the opposite Walls of the ring groove in a piston.

MATTHEW MRATTA., 

